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Sequential depolarization of root cortical and stelar cells induced by an acute salt shock - implications for Na+ and K+ transport into xylem vessels
Citation
Wegner, LH and Stefano, G and Shabala, L and Rossi, M and Mancuso, S and Shabala, S, Sequential depolarization of root cortical and stelar cells induced by an acute salt shock - implications for Na+ and K+ transport into xylem vessels, Plant, Cell and Environment, 34, (5) pp. 859-869. ISSN 0140-7791 (2011) [Refereed Article]
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Copyright Statement
© 2011 Blackwell Publishing Ltd The definitive published version is available online at: http://onlinelibrary.wiley.com/
DOI: doi:10.1111/j.1365-3040.2011.02291.x
Abstract
Early events in NaCl-induced root ion and water transport
were investigated in maize (Zeamays L) roots using a range
of microelectrode and imaging techniques. Addition of
100 mM NaCl to the bath resulted in an exponential drop in
root xylem pressure, rapid depolarization of trans-root
potential and a transient drop in xylem K+ activity (AK+)
within ~1 min after stress onset. At this time, no detectable
amounts of Na+ were released into the xylem vessels. The
observed drop in AK+ was unexpected, given the fact that
application of the physiologically relevant concentrations of
Na+ to isolated stele has caused rapid plasma membrane
depolarization and a subsequent K+ efflux from the stelar
tissues. This controversy was explained by the difference in
kinetics of NaCl-induced depolarization between cortical
and stelar cells. As root cortical cells are first to be depolarized
and lose K+ to the environment, this is associated
with some K+ shift from the stelar symplast to the cortex,
resulting in K+ being transiently removed from the xylem.
Once Na+ is loaded into the xylem (between 1 and 5 min of
root exposure to NaCl), stelar cells become more depolarized,
and a gradual recovery in AK+ occurs.
Item Details
| Item Type: | Refereed Article |
|---|---|
| Research Division: | Biological Sciences |
| Research Group: | Plant biology |
| Research Field: | Plant physiology |
| Objective Division: | Plant Production and Plant Primary Products |
| Objective Group: | Grains and seeds |
| Objective Field: | Grains and seeds not elsewhere classified |
| UTAS Author: | Shabala, L (Associate Professor Lana Shabala) |
| UTAS Author: | Shabala, S (Professor Sergey Shabala) |
| ID Code: | 72227 |
| Year Published: | 2011 |
| Web of Science® Times Cited: | 39 |
| Deposited By: | Agricultural Science |
| Deposited On: | 2011-08-24 |
| Last Modified: | 2012-05-17 |
| Downloads: | 0 |
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